/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.beam.sdk.coders;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import org.apache.beam.sdk.values.TypeDescriptor;

/**
 * Used only for tests.
 *
 * @param <T>
 */
class MockDefaultCoder<T> extends CustomCoder<T> {
  private static final MockDefaultCoder INSTANCE = new MockDefaultCoder();

  @Override
  public void encode(T value, OutputStream outStream) throws IOException {}

  @Override
  public T decode(InputStream inStream) throws IOException {
    return null;
  }

  public static <T> MockDefaultCoder<T> of(Class<T> clazz) {
    return INSTANCE;
  }

  public static CoderProvider getCoderProvider() {
    return new MockAvroCoderProvider();
  }

  static class MockAvroCoderProvider extends CoderProvider {
    @Override
    public <T> Coder<T> coderFor(
        TypeDescriptor<T> typeDescriptor, List<? extends Coder<?>> componentCoders) {
      return (Coder<T>) MockDefaultCoder.INSTANCE;
    }
  }
}
